Some people brush their teeth and spit out foam with blood; some people eat fruit with blood on the tooth marks on the fruit; some people’s teeth bleed when they speak; some people sleep with blood left on their pillow towels or quilts, which is actually bleeding gums. Gum bleeding has many causes and should not be taken lightly. Some people think it is scurvy caused by a lack of vitamin C and treat it with vitamin C, which often has little effect. Because bleeding gums are not an independent disease, but only a symptom, the most common disease is gingivitis or periodontitis. If you don’t pay attention to oral hygiene or don’t brush your teeth at all, there is often a lot of thick plaque and soft tartar buildup in the neck of your teeth, which becomes tartar over time; the gums are stimulated by bacteria and tartar and often become chronically congested; the inflamed gums are stimulated by food abrasion when chewing or bristling when brushing, which can cause bleeding. Periodontitis patients have bacteria in the flesh of their teeth, and their metabolites can cause inflammation in the periodontal tissue. Therefore, touching or stimulating the gums when talking, spitting or swallowing saliva in periodontitis patients may cause bleeding. If you have bleeding gums, you should seek prompt examination and treatment from an oral surgeon. In addition, other diseases that can cause bleeding from the flesh of the teeth include leukemia, thrombocytopenic purpura, hemophilia and aplastic anemia, which should not be taken lightly.